It is very common to experience swelling and pain in the legs and stomach. The most common cause of leg swelling and pain is overexertion. If you participate in heavy physical labor or perform prolonged strenuous exercise, patients are prone to leg swelling and pain. Generally, due to anaerobic enzymes of the body during strenuous exercise, a large amount of lactic acid is produced and muscle lactic acid accumulates, which may cause the symptoms of leg swelling and pain. In addition, patients with varicose veins in the lower extremities may also have swollen and painful legs, which are caused by poor venous return and prolonged standing, and patients with venous thrombosis in the lower extremities may also have obvious swelling and pain in the legs. In this case, we should pay attention to rest and avoid exertion. We can take heat compress, massage and massage to relieve swelling and pain and promote blood circulation, and we can apply anti-inflammatory and analgesic drugs to relieve the symptoms of pain. If the symptoms do not improve, you need to go to the hospital to check the lower extremity vascular ultrasound to exclude the lower extremity venous thrombosis caused by leg swelling and pain.